Improvement in pipe-wrenches



D. B. COOK.

PIPE-WRENCH.

'No.185,078 Patented 12%..5, 1876.

6M Mn q flni I THE GRAPHIC COJLY UNITED STATES PATENT m srea- DANIEL B. COOK, OF ITHAOA, NEW YORK.

IMPROVEMENT IN PlPE-WRENCHES.

Specification forming part of Letters Patent No. 185,078, dated December 5, 1876 application filed March 13, 1876. i

To all whom it may concern: as this motion takes place, the sliding shoul- Be it known that I, DANIEL BARNARD der of the slot S acts upon the inner curved 000K, of Ithaca, in the county of Tompkins surface of the portion A of gripe B, gradually and State of New York, have invented a new pushing it outward, and causing a revolution and useful Improvement in Pipe-Wrenches, about D until one of the teeth t" or t comes which invention and improvementis fully set in contact with'the pipe P. Then, by moving forth in the following specification, reference the lever L in the direction in which the pipe being had to the accompanying drawing, is to be turned, the gripes are held firmly whereagainst the pipe by the wedge-like action of Figure 1 shows the tool open, and Fig. 2 the sliding shoulder S upon the curved porshows it shut about a pipe. tion A of pipe B, and the reaction of gripe G,

This wrench consists ofaslotted bent lever, caused by the two connections t t and D. L, with a sliding shoulder, b, attached to a The crushing power of the gripes is a direct gripe, G, by a hinge-joint, H, as shown in the function of the force acting at the end of the drawing, and asecond gripe, B, attached, bya lever; hence there can be no danger of a similar joint, to gripe U at D, and prolonged slip in cases of great resistance, when the in a curve through the slot in @he lever L, as teeth are in reasonable condition. By reversshown at A. The gripesB and O are furnished ing the lever, the gripes are opened and the .with teeth t t t, (and t, when desired,) pipe released, and by reversing the wrench which are fitted into the gripes in such a manthe pipe can be turned in the opposite direcner as to be easily replaced, each one of them tion. A being dovetailed into the gripe, and held from I claim as my inventionsliding by a slight upset made with a The combination of slotted bent lever L, prick-punch. The wrench is to be made having the sliding shoulder S, gripe B, with of cast-steel 0r malleable iron, with steel teeth curved extension A, riding in the slot of the and rivets, the teeth being hardened. lever, and gripe O, hinged to gripe B, and to To use this wrench, place the teeth tt of the end of the slotted lever, as and for the gripe 0 against the pipe 1?, as shown in the purpose set forth.

drawing, and then give a slight pull in the direction of the lever L. This causes a rota- DANIEL B. COOK. tion about t t in a direction opposite to that Witnesses: in which the pipe is to be turned, thus caus- FRANK O. CORNELL,

ing a departure of D from the lever L; and HORACE J. SMITH., 

